We are returning from our Disney trip 5/1/10 at 8:55 pm on Southwest. I purchased the "Early Bird" option for all of us on the way to MCO mainly to ensure my daughter got a good window seat and we all 3 are seated together on the way to MCO. But I did not get the "Early Bird" option on the return trip mainly because it will be dark out and the window seat will not matter. Was this a good idea in my part? This is our first flight anywhere and this flight is apparently the last flight out of MCO for that day... My only concern is the availability for us 3 to be seated together. Do the late flights generally fill up??